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Seventy-six people were injured when part of the roof came down during a performance of The Curious Incident of The Dog In The Night-Time in December.
BBC Radio 4's You and Yours has seen a letter from Westminster City Council saying hessian wadding embedded in the ceiling was getting weaker over time.
The material's deterioration led to the collapse, the council said.
— bbc.com
Previously: London theatre collapse: scores injured at Apollo in West End View full entry
